Rent the 24 footer, it is easier to maneuver than the 26 because of the rear overhang, when entering parking spaces or lots try to park in such a way that you drive forward without having to turn arround with 6 to 8 point moves, and plan the entry so that you do not get blocked in by inconsiderate people.
Mesa verde is accesible with a small RV both in the visitor center and the cliff houses, some tourist atractions have passenger bus parking areas park there at the far end and walk to the enrtance or attraction, some tour operators get anoied at Rv,s parked near the entrance.
Enjoy the travell
navegator